var momObj = function () {
  this.x;
  this.y;
  this.angle;
  this.bigEye = new Image();
  this.bigBody = new Image();
  this.bigTail = new Image();
}

momObj.prototype.init = function () {
  this.x = canWidth * 0.5;
  this.y = canHeight * 0.5;
  this.angle = 0;
  this.bigEye.src = './src/bigEye0.png';
  this.bigBody.src = './src/bigSwim0.png';
  this.bigTail.src = './src/bigTail0.png';
}

momObj.prototype.draw = function () {
  this.x = lerpDistance(mx, this.x, 0.98);
  this.y = lerpDistance(my, this.y, 0.99);

  var deltaY = my - this.y;
  var deltaX = mx - this.x;
  var beta = Math.atan2(deltaY, deltaX) + Math.PI; // [-PI, PI]

  this.angle = lerpAngle(beta, this.angle, 0.6);

  ctx1.save();
  ctx1.translate(this.x, this.y);
  ctx1.rotate(this.angle);
  ctx1.drawImage(this.bigEye, -this.bigEye.width * 0.5, -this.bigEye.height * 0.5);
  ctx1.drawImage(this.bigBody, -this.bigBody.width * 0.5, -this.bigBody.height * 0.5);
  ctx1.drawImage(this.bigTail, -this.bigTail.width * 0.5 + 30, -this.bigTail.height * 0.5);
  ctx1.restore();
}